We are seeking experienced Full-Stack / API Developers to join our client’s team. The successful candidates have profficient level of German language strong background in REST API development and JavaScript, along with proficiency in engaging within agile software environments. The role requires collaboration in a remote setup, addressing both frontend and backend development tasks with an emphasis on integrating advisory solutions into an established system.Main Responsibilities: Develop and integrate REST API interfaces into existing systems. Implement technical requirements within a large-scale integration and brokerage project. Engage in full-stack development in the JavaScript ecosystem (frontend & backend). Collaborate with internal and external developers in a distributed agile setup. Analyze and evaluate existing codebase, contributing to architectural decisions. Convert business requirements into technical solutions & maintain documentation. Work closely with team leads, business units, and stakeholders. Support onboarding-related topics with guidance from FI. Key Requirements: Strong experience in REST API development & API design. Excellent JavaScript skills (full-stack). Proven experience as a Full-Stack Developer. Background in agile software development. Ability to analyze, structure and optimize existing code. Proactive communicator & team player. Fluent German (B2+/C1) - essential for documentation & daily communication. Nice to Have: Experience in regulated industries (banking, insurance, energy). IT security / firewall / networking knowledge. Experience with document management systems. Background in integration-heavy or interface-driven projects. Experience in the German financial sector. Other Details:This role involves a one-week onboarding on-site in Hanover, followed by remote work. The engagement is long-term with an annual on-site workshop and potential additional visits based on demand. Travel costs will be calculated separately.